That's how we build LC_CTYPE data files, LC_CTYPE section in *.src gets removed, and replaced with common.UTF-8.src, but the file itself should exist, so it's a placeholder. This could be improved, probably, but I wanted as small change as possible.

Thinking a bit more about it, with this change, the LC_CTYPE data file that is the same for all UTF-8 locales will now be shipped in SUNWcs, so always present. That will allow us to make all other locale's LC_CTYPE data files be a hardlink to this one, and will save us some build time. But that's for separate change.